<template>
  <div>
    <el-form ref="loginForm"
             v-loading="loading"
             element-loading-text="登录中"
             element-loading-spinner="el-icon-loading"
             element-loading-background="rgba(0, 0, 0, 0.8)"
             :model="loginForm"
             :rules="rules"
             class="loginContainer">
      <h3 class="loginTitle">系统登录</h3>
      <!--用户名-->
      <el-form-item prop="username">
        <el-input type="text" auto-complete="false" placeholder="请输入用户名" value="admin"
                  v-model="loginForm.username"></el-input>
      </el-form-item>
      <!--密码-->
      <el-form-item prop="password">
        <el-input type="password" auto-complete="false" placeholder="请输入密码" value="123456"
                  v-model="loginForm.password"></el-input>
      </el-form-item>
      <!--验证码-->
      <el-form-item prop="code">
        <el-input type="text" auto-complete="false" placeholder="点击图片更换验证码" v-model="loginForm.code"
                  style="width: 250px;margin-right: 5px;"></el-input>
        <img :src="captchaUrl" @click="updateCaptcha">
      </el-form-item>
      <el-checkbox v-model="checked" class="loginRemember">记住我</el-checkbox>
      <el-button type="primary" style="width: 100%" @click="submitLogin">登录</el-button>
    </el-form>
  </div>
</template>

<script>

export default {
  name: "Login",
  data() {
    return {
      captchaUrl: '/captcha?time=' + new Date(),
      loginForm: {
        username: '',
        password: '',
        code: '',
      },
      loading: false,
      checked: true,
      // 校验规则
      rules: {
        username: [{required: true, message: '用户名不能为空', trigger: 'blur'}],
        password: [{required: true, message: '密码不能为空', trigger: 'blur'}],
        code: [{required: true, message: '验证码不能为空', trigger: 'blur'}]
      }
    }
  },
  methods: {
    // 更换验证码
    updateCaptcha() {
      this.captchaUrl = '/captcha?time=' + new Date();
    },
    // 登录
    submitLogin() {
      this.$refs.loginForm.validate((flag) => {
        if (flag) {
          this.loading = true;
          this.postRequest('/login', this.loginForm).then(result => {
            if (result) {
              this.loading = false;
              // 存储用户token
              const tokenStr = result.data.tokenHead + result.data.token;
              window.sessionStorage.setItem("tokenStr", tokenStr);
              // 跳转登录
              // 已登录的情况下，如果用户输入网页地址，直接跳转对应的页面
              // 拿到要跳转的路径
              let path = this.$route.query.redirect;
              // 判断路径是首页或者undefined就跳转到首页，否则就跳转到用户输入的页面
              this.$router.replace((path == '/' || path == undefined) ? '/home' : path);
            }
          })
        } else {
          this.$message.error('请完整填写表单');
          return false;
        }
      });
    },
  },
}
</script>

<!--样式-->
<style>
.loginContainer {
  border-radius: 15px;
  background-clip: padding-box;
  margin: 180px auto;
  width: 350px;
  padding: 15px 35px 15px 35px;
  background-color: #fff;
  border: 1px solid #eaeaea;
  box-shadow: 0 0 25px #cac6c6;
}

.loginTitle {
  text-align: center;
  margin: 0 auto 40px auto;
}

.loginRemember {
  text-align: left;
  margin: 0 0 15px 0;
}

.el-form-item__content {
  display: flex;
  align-items: center;
}
</style>